Mammals like you or me breathe air. I have some examples. Whales, Human, and Camels. Here are some of the reasons that they are designated as mammals: Give live birth, hair, breathe air (as I said before), and much more!
FUN FACT: Did you know that elephants are mammals too? They have tiny little hairs on their body that you can barely see!
FUN FACT: Did you know that elephants are mammals too? They have tiny little hairs on their body that you can barely see!